buypeeb-cs/Listing.cs

using System;
using System.Globalization;
using System.Text.RegularExpressions;
using System.Collections.Generic;
using System.Text.Json;

namespace Buypeeb {
	class Listing {
		public string url {
			get {
				return $"https://page.auctions.yahoo.co.jp/jp/auction/{this.id}";
			}
		}
		public string id { get; set; }
		public string name { get; set; }
		public int price = 0;
		public int win_price;
		public string original_name;
		public bool favourite { get; set; } = false;
		// start_date, end_date
		public int bids;
		public bool auto_extension;
		public bool ready;

		private bool success { get; set; } // TODO: custom setter that throws an exception if set to false or something idk

		public Listing(string id, string name) {
			this.id = id;
			this.name = name;
			this.ready = false;
		}

		public Listing() {
			// parameterless constructor for deserialisation
		}

		public void Update(string html) {
			var rx = new Regex(@"var pageData ?= ?(\{.+?\});", RegexOptions.Singleline); // TODO: maybe compile and match the regex in another thread
			var m = rx.Match(html);
			if (m == null) {
				Console.WriteLine("no sir i don't like it");
				return;
			}

			Dictionary<string, Dictionary<string, string>> j_full;
			try {
				// master forgive me, but i must go all out, just this once...
				j_full = JsonSerializer.Deserialize<Dictionary<string, Dictionary<string, string>>>(m.Groups[1].Value);
			}
			catch (Exception e) {
				throw e;
			}

			var j = j_full["items"];
			this.original_name = j["productName"];
			this.success = int.TryParse(j["price"], out this.price);
			this.success = int.TryParse(j["winPrice"], out this.win_price);
			this.success = int.TryParse(j["bids"], out this.bids);

			if (String.IsNullOrWhiteSpace(this.name)) {
				this.name = this.original_name;
			}

			// as far as i can tell, neither the `pageData` nor the `conf` variables in the html seem to store whether or not the auction uses automatic extension
			// the `conf` variable *does* store whether or not the auction has the "early end" feature enabled, in the key `earlyed`.
			// unfortunately, it seems like the only way to get the auto extension info is to scrape the page for the info column that displays the auto ext status
			// and check whether or not it's equal to "ari" (japanese for "yes").
			var autoExtensionCheck = new Regex(@"自動延長.+\n.+>(.+)<");
			m = rx.Match(html);
			if (m.Groups[1].Value != null) {
				this.auto_extension = (m.Groups[1].Value == "あり");
			}
		}

		public string PriceAUD() {
			double aud = this.price / 75.0;
			return $"${aud:f2}";
		}

		public string PriceJPY() {
			return $"¥{this.price}";
		}
	}
}